Horticultural Science & Technology (원예과학기술지)

Korean Society of Horticultural Science (한국원예학회)
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Improvement of Canopy Light Distribution, Photosynthesis, and Growth of Lettuce (Lactuca Sativa L.) in Plant Factory Conditions by Using Filters to Diffuse Light from LEDs

LED 식물공장에서 산란 유리 이용에 의한 상추(Lactuca Sativa L.)의 군락 광분포, 광합성 및 생장 향상

  • Kang, Woo Hyun (Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Zhang, Fan (Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Lee, June Woo (Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University) ;
  • Son, Jung Eek (Department of Plant Science and Research Institute of Agriculture and Life Sciences, Seoul National University)
  • 강우현 (서울대학교 식물생산과학부 및 농업생명과학연구원) ;
  • 장범 (서울대학교 식물생산과학부 및 농업생명과학연구원) ;
  • 이준우 (서울대학교 식물생산과학부 및 농업생명과학연구원) ;
  • 손정익 (서울대학교 식물생산과학부 및 농업생명과학연구원)
  • Received : 2015.06.24
  • Accepted : 2016.01.25
  • Published : 2016.02.29
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Abstract

Plant factories with artificial lights require a large amount of electrical energy for lighting; therefore, enhancement of light use efficiency will decrease the cost of plant production. The objective of this study was to enhance the light use efficiency by using filters to diffuse the light from LED sources in plant factory conditions. The two treatments used diffuse glasses with haze factors of 40% and 80%, and a control without the filter. For each treatment, canopy light distribution was evaluated by a 3-D ray tracing method and canopy photosynthesis was measured with a sealed acrylic chamber. Sixteen lettuces for each treatment were cultivated hydroponically in a plant factory for 28 days after transplanting and their growth was compared. Simulation results showed that the light absorption was concentrated on the upper part of the lettuce canopy in treatments and control. The control showed particularly poor canopy light distribution with hotspots of light intensity; thus the light use efficiency decreased compared to the treatments. Total light absorption was the highest in the control; however, the amount of effective light absorption was higher in treatments than the control, and was highest in treatment using filters with a haze factor of 80%. Canopy photosynthesis and plant growth were significantly higher in all the treatments. In conclusion, application of the diffuse glass filters enhanced the canopy light distribution, photosynthesis, and growth of the plants under LED lighting, resulting in enhanced the light use efficiency in plant factory conditions.

인공광 식물공장은 조명에 많은 전력이 소요되므로 광이용효율의 향상은 필수적이다. 본 연구에서는 식물공장의 LED 광원에 산란 유리를 사용함으로써 광이용효율을 향상하고자 하였다. 실험에는 Haze factor 40%와 80%의 산란 유리가 적용된 두 가지 처리구와 산란 유리를 사용하지 않은 대조구를 두었다. 3-D 광선추적기법을 이용하여 상추 작물의 군락 광분포를 분석하였으며 군락 광합성률은 밀폐 아크릴 챔버를 이용하여 측정하였다. 각 처리구 별로 16주의 상추를 수경재배 방식으로 28일간 재배하여 생장량을 비교하였다. 시뮬레이션 결과, 모든 처리구에서 작물의 상단부에 광량이 집중되었고 대조구에서 작물 상부에 광량 핫스팟이 발생하며 처리구에 비하여 광이용효율이 감소하였다. 총 광 흡수량은 대조구에서 가장 높았으나 유효 광 흡수량은 처리구에서 더 높았고 산란광의 비율이 높은 처리에서 더 높게 나타났다. 작물의 군락 광합성률과 생장량은 산란 유리를 사용한 처리구에서 대조구에 비해 높게 나타났다. 결과적으로 산란 유리의 이용을 통해 상추의 군락 내 광분포가 개선되었고 군락 광합성률 및 생장량이 증가하여 식물공장의 광이용효율이 향상되는 것으로 나타났다.

Keywords

References

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